Authors: L Young; E P Kanter; B Krässig; Y Li; A M March; S T Pratt; R Santra; S H Southworth; N Rohringer; L F Dimauro; G Doumy; C A Roedig; N Berrah; L Fang; M Hoener; P H Bucksbaum; J P Cryan; S Ghimire; J M Glownia; D A Reis; J D Bozek; C Bostedt; M Messerschmidt Journal: Nature Date: 2010-07-01 Impact factor: 49.962